19U9.] 



OF MONKEYS OF THE GENUS PITHECIA. 



931 



much reduced in length, as is represented to be the case in Flower's 

 figure (6, p. 330, fig. 4 b) of the mesial aspect of the brain of 

 P. monachus. The backwardly running part of the Y, which is 

 parallel to the surface of the hemisphere, is very much the longer. 

 This pai't of the calcarine complex is moreover much nearer to the 

 surface of the brain than is that of the left hemisphere. 



§ Larynx and Trachea. 



The accompanying drawing (text-fig. 287) represents the larynx 

 and a portion of the trachea of Pithecia pithecia shown in due 

 relation to the adjacent structures. The body of the hyoid is 



Text-fig. 287. 



Larynx and a portion of the tracliea of Pithecia pithecia. seen in situ from 

 the ventral surface. 



not exposed, being covered by the platysma muscle which is 

 represented as uncut. The enormously increased thyroid cartilage 

 is seen to occupy a very large space between the j-ami of the 

 Proc. Zool. Soc— 1909, No. LXIII. 63 



